Please help...

please give us the link to the original post.

It should be answered on the original.

You do not nedd to repeat the question,  Just give the link and ask for more help.

Here's my best attempt

Since A  joins C   (without overlap)   the circumference of the  cylinder  =  6

So   the radius  can  be figured     as   

6  =  2pi * r

r  = 3  / pi

And since we know the volume of the  cylinder  we  can  figure the height as

(27/2) =  pi  (3/ pi)^2  * h

(27/2)  =  9 / pi  * h

h =  ( 27pi)  / (2 * 9)  =    27pi /18  =   3 pi /2

So.....this also   =  the  rhombus height

And the sin BAD  =   rhombus height  / rhombus side   =   (3 pi/2) / 6  =   pi  / 4

Corrected   !!!!

Original post: https://web2.0calc.com/questions/consider-rhombus-abcd-with-side-length-6

My work: 

I got that the circumference would be 6, so the area of the base would be 9. Then, I got that the height is 3/2 because 9*3/2 = 27/2. But, when I typed in 1/4 for the answer which is (3/2)/6 it was wrong.

I got it!!!!!!

I forgot to type in the pi...

Its pi/4!!!!